Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bae4a810cfa2ee…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 04:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7a7638b8fd608df60359e734fb23685e SHA-1: d42342e5ac642fa5374a97c3d17e2c016605c04c SHA-256: a6bae4a810cfa2eef3d887dde1ae15995a735e8763e0b786f9ada8f01113434a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=metro+2033+film+2022 PDF link annotation
    • http://latuha.com/random_four_digit_number_generatorhed60.pdfIn PDF document text
    • http://tryraisins.pro/driver_impresora_hp_laserjet_1100_windows_7_64_bitsazfzh.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/gcjqPjb/dictionary_of_antonyms_and_synonyms.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/28399334208.pdfIn PDF document text
    • http://youtube-subscribes.com/pumozumewuminigelowijanownb86w.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/Rghicjg/amiga_kickstart_rom_mac.pdfIn PDF document text
    • http://vigikigopaloze.medianewsonline.com/kenneth_copeland_healing_scripture_for_health_and_strength.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/1734-ep24dc_installation_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/jbkjhDq/defender_90_vs_110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d229a680-38b3-46df-b19c-3afa4e9afcf0/lg_washing_machine_repair_service_centre_pune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68866ca-02af-4d50-9c51-71ee5be922a1/20179913809.pdfIn PDF document text
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_7de599fe6bd44e5b9427b9ed20b1d587.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e9c1b8-8961-47a7-80fb-3f78b147c544/toner_fr_hp_laserjet_1012.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_128cc30cfb814242a98d29d5ac9d9f49.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_be36cd726e4d4e0fabb8c64b890b818f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ced277-a612-4b8b-8b18-6943bc3f4794/how_much_coffee_to_use_in_keurig_reusable_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5b5a61-b461-4e88-9361-a7bd9ef7f0fe/bushnell_neo_ghost_factory_reset.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/nemixavotajuxopoxovalorar.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_83065f43425441c8ba255d0cadc92032.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/153cf49d-2af7-4740-8c7e-c15d04da8b0d/us_history_regents_questions_by_topic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4366d3ea-2482-4dfe-80b0-5532134f32f2/dark_blue_dresses_short.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86eac293-ca74-4db7-bb5e-c735299cac7b/how_to_install_windows_7_from_usb_pen_drive_in_lenovo_laptop.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_616a7e1f1952444a80737d6a88bc8ca0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 4968 bytes
SHA-256: f81ccef5ab73c18045157dbdf2a92382a1741bb6eddb1498c030501ff8ad9c9d
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 12592 bytes
SHA-256: 05c90297de645be5219c97dbcfe8a7ac3b2a0d49ef92d327a07e9ef55151c506